Maximum RF output for a 2sc2879 transistor

Discussion in 'Electronic Design' started by Night Ranger, Dec 26, 2003.

  1. Night Ranger

    Night Ranger Guest

    Night Ranger, Dec 26, 2003
    #1
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  2. Night Ranger

    John Todd Guest

    On 25 Dec 2003 22:57:19 -0800, Night Ranger <> wrote:
    >I've was looking at the specs on the Toshiba 2sc2879 transistor,...
    >
    >http://www.toshiba.com/taec/components/Datasheet/2SC2879.pdf
    >
    > and it claims a 100 PEP output, yet several CB amplifier
    >manufacturers claim to be getting twice that or more out of their amps
    >in class B service.
    >
    >See;
    >
    >http://www.davemade.com
    >
    >and
    >
    >http://www.xforceamps.com
    >
    >Are they full of shit, or can you really exceed the transistor design
    >specs by that amount without blowing the transistor?
    >
    >-Thanks


    Maybe that Toshie spec is for a single transistor? Maybe the
    "class B" is two transistors push-pull?



    --
    _______________________________________
    John E. Todd <>

    Note: Ensure correct polarity prior to connection.
     
    John Todd, Dec 26, 2003
    #2
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  3. Hi,

    >I've was looking at the specs on the Toshiba 2sc2879 transistor,...
    >
    >http://www.toshiba.com/taec/components/Datasheet/2SC2879.pdf
    >
    > and it claims a 100 PEP output, yet several CB amplifier
    >manufacturers claim to be getting twice that or more out of their amps
    >in class B service.
    >


    In days of yore, transmitting tubes had two sets of
    ratings - CCS and ICAS. Under the first they would loaf
    along and hopefully last a while, whereas with the second
    they were run close to maximum and only meant to be used
    intermittently. Although here we are talking about
    transistors, I suspect these people are applying the same
    philosophy.

    However, note that the Toshiba spec (100W) for the
    2SC2879 is for a single device and the CB linears they are
    peddling, unless I've read their sites incorrectly, are
    using at least two. The power in/out graph per device does
    show a capability of up to 140W, although the IMD at 100W is
    -24dB and worsening. One of them also specs the PEP output
    output using a Bird peak-reading meter and quotes the
    continuous output in W(rms)?

    Having said all of that, I suppose that the amps would
    deliver as stated if you don't mind changing the output
    devices fairly often.


    Cheers - Joe
     
    Joe McElvenney, Dec 26, 2003
    #3
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